Comparison of different commercial FFDM units by means of physical characterization and contrast‐detail analysis

Rivetti, Stefano; Lanconelli, Nico; Campanini, R.; Bertolini, Marco; Borasi, Giovanni; Nitrosi, Andrea; Danielli, C.; Angelini, L; Maggi, Stefania

doi:10.1118/1.2358195

Cited by 68 publications

(71 citation statements)

References 30 publications

(29 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…( 4 , 5 ) This decrease in MTF with respect to the previous GE model may be understood according to the changes introduced in the new system. Specifically, the CsI:Tl scintillator thickness is increased in order to enhance DQE at low spatial frequencies.…”

Section: Resultsmentioning

confidence: 90%

Study of DQE dependence with beam quality on GE Essential mammography flat panel

García-Mollá

2010

J Applied Clin Med Phys

View full text Add to dashboard Cite

This paper deals with the analysis of the behavior of objective image quality parameters for the new GE Senographe Essential FFDM system, in particular its dependence with beam quality. The detector consists of an indirect conversion a‐Si flat panel coupled to a CsI:Tl scintillator. The system under study has gone through a series of relevant modifications in flat panel with respect to the previous model (GE Senographe DS 2000). These changes in the detector modify its performance and are intended to favor advanced applications like tomosynthesis, which uses harder beam spectra and lower doses per exposure than conventional FFDM. Although our system does not have tomosynthesis implemented, we noticed that most clinical explorations were performed by automatically selecting a harder spectrum than that of typical use in FFDM (Rh/Rh 28–30 kV instead of Mo/Mo 28 kV). Since flat‐panel optimization for tomosynthesis influences the usual FFDM clinical performance, the new detector behavior needed to be investigated. Therefore, the aim of our study is evaluating the dependence of the detector performance for different beam spectra and exposure levels. In this way, we covered the clinical beam quality range (Rh/Rh 28–30 kV) and we extended the study to even harder spectra (Rh/Rh 34 kV). Detector performance is quantified by means of modulation transfer function (MTF), normalized noise power spectrum (NNPS) and detective quantum efficiency (DQE). We found that flat‐panel optimization results in slightly – but statistically significant – higher DQE values as beam quality increases, which is contrary to the expected behavior. This positive correlation between beam quality and DQE is also diametrically opposite to that of the previous model by the same manufacturer. As a direct consequence, usual FFDM takes advantage of the changes in the detector, as less exposure is needed to achieve the same DQE if harder beams are used.PACS number: 87.59.ej

show abstract

Section: Resultsmentioning

confidence: 90%

Study of DQE dependence with beam quality on GE Essential mammography flat panel

García-Mollá

2010

J Applied Clin Med Phys

View full text Add to dashboard Cite

show abstract

“…Ancak ilave gürültünün karakteristiği ve frekansı hakkında herhangi bir bilgi elde edilememektedir [6]. Bir dijital görüntüdeki kuantum gürültüsüne ek gürültü kaynaklarının varlığının saptanmasına yönelik literatürde çeşitli yöntemler önerilmiştir [5][6][7][8][9][10] …”

Section: Gi̇ri̇ş (Introduction)unclassified

Di̇ji̇tal Radyografi̇ Si̇stemleri̇nde Gürültünün Konum Ve Frekans Uzayinda İrdelenmesi̇

Olğar

2017

SAÜ Fen Bilimleri Enstitüsü Dergisi

View full text Add to dashboard Cite

ÖZDijital radyografi görüntüsündeki gürültü miktarı, düşük kontrasttaki lezyonların saptanmasına önemli ölçüde sınırlama getirir. Bu çalışmanın amacı bir dijital radyografi görüntüsünde, gürültü bileşenlerinin hem konum hem de frekans uzayında saptanmasıdır. Konum uzayında gürültü analizi bağıl gürültü varyansı analiz yöntemi ile, frekans uzayında gürültü analizi ise normalize gürültü güç spektrumunun ölçülmesi aracılığıyla gerçekleştirilmiştir. Anahtar Kelimeler: Gürültü, Varyans, Gürültü Güç SpektrumuInvestigation of the noise in spatial and frequency domain for digital radiography systems ABSTRACT Noise amount in digital radiographic image puts a limitation on detection of low contrast lesions. The aim of this study is to investigate of the noise component in digital radiographic image in both spatial and frequency domain. Noise analysis in spatial and frequency domain was performed by using relative noise variance and noise power spectra measurement methods, respectively.

show abstract

“…In the past few years, the most recognized and comprehensive metric of image quality performance for digital radiographic and mammographic systems has been the detective quantum efficiency (DQE), a measure of the efficiency of a detector when using the input signal-to-noise ratio (SNR) provided by a limited number of x-ray photons to form an image at a certain exposure or dose level. With measurement methods largely standardized (1)(2)(3)(4)(5), a number of studies have reported the variations in DQE performance of these imaging systems (6)(7)(8)(9).…”

Section: Rsna 2008mentioning

confidence: 99%

Detector or System? Extending the Concept of Detective Quantum Efficiency to Characterize the Performance of Digital Radiographic Imaging Systems

Samei¹,

Ranger²,

Mackenzie³

et al. 2008

Radiology

View full text Add to dashboard Cite

Purpose:To develop an experimental method for measuring the effective detective quantum efficiency (eDQE) of digital radiographic imaging systems and evaluate its use in select imaging systems. Materials and Methods:A geometric phantom emulating the attenuation and scatter properties of the adult human thorax was employed to assess eight imaging systems in a total of nine configurations. The noise power spectrum (NPS) was derived from images of the phantom acquired at three exposure levels spanning the operating range of the system. The modulation transfer function (MTF) was measured by using an edge device positioned at the anterior surface of the phantom. Scatter measurements were made by using a beamstop technique. All measurements, including those of phantom attenuation and estimates of x-ray flux, were used to compute the eDQE. Results:The MTF results showed notable degradation owing to focal spot blur. Scatter fractions ranged between 11% and 56%, depending on the system. The eDQE(0) results ranged from 1%-17%, indicating a reduction of up to one order of magnitude and different rank ordering and performance among systems, compared with that implied in reported conventional detective quantum efficiency results from the same systems. Conclusion:The eDQE method was easy to implement, yielded reproducible results, and provided a meaningful reflection of system performance by quantifying image quality in a clinically relevant context. The difference in the magnitude of the measured eDQE and the ideal eDQE of 100% provides a great opportunity for improving the image quality of radiographic and mammographic systems while reducing patient dose. Note: This copy is for your personal, non-commercial use only. To order presentation-ready copies for distribution to your colleagues or clients, use the Radiology Reprints form at the end of this article. Image quality is an important attribute of an imaging system, as it can have a measurable effect on the diagnostic utility and clinical usability of a system. To ensure sufficient and consistent performance, it is necessary to be able to assess image quality quantitatively so that it can be optimized and monitored to maintain a high level of clinical care. In the past few years, the most recognized and comprehensive metric of image quality performance for digital radiographic and mammographic systems has been the detective quantum efficiency (DQE), a measure of the efficiency of a detector when using the input signal-to-noise ratio (SNR) provided by a limited number of x-ray photons to form an image at a certain exposure or dose level. With measurement methods largely standardized (1-5), a number of studies have reported the variations in DQE performance of these imaging systems (6-9).While the DQE provides a quantitative measure of image quality per unit of exposure to the detector, it does not include some important attributes of the total system that affect the quality of images captured clinically. Clinical images are affected by the presence of scattered radiation, ...

show abstract

Comparison of different commercial FFDM units by means of physical characterization and contrast‐detail analysis

Cited by 68 publications

References 30 publications

Study of DQE dependence with beam quality on GE Essential mammography flat panel

Study of DQE dependence with beam quality on GE Essential mammography flat panel

Di̇ji̇tal Radyografi̇ Si̇stemleri̇nde Gürültünün Konum Ve Frekans Uzayinda İrdelenmesi̇

Detector or System? Extending the Concept of Detective Quantum Efficiency to Characterize the Performance of Digital Radiographic Imaging Systems

Contact Info

Product

Resources

About